Define an ACL for each known type ( src , dst , ident , etc.) and write a rule that uses all of them.
Intentionally mistype the name of an ACL in one of your rules. Does squid -k parse catch the error? Does Squid start anyway?
Write an http_access that uses slow ACLs, like srcdomain or ident . Time how long Squid takes to serve a request with and without the slow ACL checks.